Which two types of fields appear blue?

In Tableau, blue identifies discrete fields, regardless of whether the field is classified as a dimension or a measure. Therefore, both Discrete dimensions and Discrete measures appear blue, making B and C correct. Tableau separates two different field characteristics. The first is the semantic role: dimension or measure. The second is the behavioral classification: discrete or continuous. These concepts are related but not equivalent. A discrete field contains distinct values and normally creates headers when added to Rows or Columns. Tableau represents the pill in blue. Most dimensions are discrete by default, so blue dimensions are common. Measures are generally continuous, but a measure can be converted to discrete; once it is discrete, its pill also becomes blue. Continuous fields appear green. Continuous dimensions—most commonly continuous date dimensions—and continuous measures therefore use green pills and typically create axes rather than headers. Tableau's official Dimensions and Measures documentation explicitly presents four valid combinations: discrete dimensions, continuous dimensions, discrete measures, and continuous measures. It shows discrete dimensions and discrete measures as blue, while both continuous forms are green. This distinction is foundational to predicting how Tableau will structure a visualization.